Weird discharge!

39 weeks and 1 day right now and earlier my underwear were all wet, it didn't smell like pee and it didn't really have an odor. I felt it tho and it was kinda oily feeling. I thought maybe it was normal discharge so I just changed my underwear and put a panty liner on and since it didn't happen again within an hour I took off the liner but it just happened again! My underwear are soaked with that oily stuff. Is this normal???